US10389216B2 - Stator applicable to a single-phase or polyphase motor, motor comprising the stator and compressor comprising the motor or the stator - Google Patents

Stator applicable to a single-phase or polyphase motor, motor comprising the stator and compressor comprising the motor or the stator Download PDF

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Publication number
US10389216B2
US10389216B2 US15/392,350 US201615392350A US10389216B2 US 10389216 B2 US10389216 B2 US 10389216B2 US 201615392350 A US201615392350 A US 201615392350A US 10389216 B2 US10389216 B2 US 10389216B2
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Prior art keywords
stator
motor
iron core
cut edges
center
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US20170194845A1 (en
Inventor
Weiping Tang
Li Yao
Wanzhen Liu
Guangqiang Liu
Yan Lin
Zhenyu Wang
Meng Wang
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Danfoss Tianjin Ltd
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Danfoss Tianjin Ltd
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Assigned to DANFOSS (TIANJIN) LTD. reassignment DANFOSS (TIANJIN) LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIN, YAN, LIU, GUANGQIANG, LIU, Wanzhen, TANG, WEIPING, WANG, MENG, WANG, ZHENYU, YAO, LI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/12—Asynchronous induction motors for multi-phase current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0085—Prime movers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/04—Asynchronous induction motors for single phase current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/18—Windings for salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the present invention relates to the technical field of air conditioning or refrigeration technologies, and particularly, to a stator, a motor and a compressor.
  • a motor generally includes a stator and a rotor.
  • the rotor is mounted inside the stator, supported by the housing, and rotatable relative to the stator.
  • the stator and/or the rotor of the motor has a winding including coils.
  • electric power passes through the coils to generate a magnetic field, thereby rotating the rotor.
  • the motor particularly a three-phase induction motor, can be applied to drive a compressor (for example, a scroll compressor) in the air conditioning or refrigeration industry.
  • a compressor for example, a scroll compressor
  • the size and performance of the compressor including the motor have generally great impact on the size, working efficiency and stability of air conditioning apparatus including the compressor.
  • machinability and costs of components in the motor are also important factors in the motor design.
  • the efficiency of the motor may be improved by replacing an induction motor with a permanent magnet motor or by optimizing the motor design by using an optimization algorithm.
  • the cooling performance of the motor may be improved by optimization of structures of the components in the motor, in order to obtain a better efficiency in taking heat away from the motor and to enable a lower temperature for the motor.
  • an additional part such as a cooling medium baffle may be provided in the motor to facilitate cooling or heat dissipation.
  • an objective of the present invention provides a stator for a motor, particularly for a three-phase induction motor.
  • the stator can improve the cooling performance of the motor and thus improve stable operation capability of an oil return system of a compressor, without significantly affecting performance, particularly, efficiency of the motor.
  • Another objective of the present invention provides a motor, particularly a three-phase induction motor, using the above-mentioned stator.
  • Yet another objective of the present invention provides a compressor using the above-mentioned stator or motor.
  • a stator applicable to a single-phase or polyphase motor includes a stator iron core and a winding.
  • the stator iron core includes: an annular yoke; multiple stator teeth, near ends of the stator teeth being fixedly adjacent to an inner surface of the yoke and projecting inward towards a center of the stator iron core along a radial direction of the yoke, remote ends of the stator teeth that face inward along the radial direction defining a center hole for accommodating a rotor, and the multiple stator teeth being spaced from each other in a circumferential direction; and multiple stator slots, each stator slot being defined between two neighboring stator teeth.
  • the winding is wound on the stator teeth and operable for generating a rotating magnetic field.
  • the yoke of the stator iron core has at least two cut edges at an outer periphery of the stator iron core.
  • the number of the at least two cut edges is an even number; among the even number, every two opposite cut edges are arranged as a pair in parallel on two sides of the center of the stator iron core, and the center of the stator iron core is located in the middle of a connecting line between respective center points of the two opposite cut edges in each pair.
  • respective distances from the center of the stator iron core to the respective center points of the cut edges in said at least one pair are different.
  • arc segments between neighboring cut edges are located on a same circle on the outer periphery of the yoke, and a center of the circle coincides with the center of the stator iron core.
  • the arc segments between the neighboring cut edges are not evenly distributed in the circumferential direction.
  • stator iron core is made of a laminated and stamped silicon steel sheet material.
  • the stator iron core is an integral unit manufactured by a process of directly stamping a silicon steel sheet on which cut edges, stator teeth, and stator slots have been machined; or by a process of stamping a silicon steel sheet and performing edge-cutting on an outer periphery of the stamped silicon steel sheet.
  • a motor is provided.
  • the motor includes a rotor and the above-mentioned stator.
  • the rotor is rotatably disposed in the stator and is spaced apart from the stator by a distance.
  • the motor is a fixed-frequency motor or a variable-frequency motor.
  • the motor is a three-phase induction motor.
  • an operating voltage of the motor is 200V to 575V or an operating voltage of a driver for the motor is 200V to 575V.
  • a compressor includes the above-mentioned stator or the above-mentioned motor.
  • the compressor is a scroll compressor.
  • a suction port for gas suction in the compressor is configured to be close to a cut edge whose center point is closer to a center of a stator iron core than other cut edge belonging to a same pair.
  • stator for a single-phase or polyphase motor.
  • the stator includes a stator iron core and a winding.
  • the stator iron core includes: an annular yoke, multiple stator teeth, near ends of the stator teeth being fixedly adjacent to an inner surface of the yoke and projecting inward towards a center of the stator iron core along a radial direction of the yoke, remote ends of the stator teeth that face inward along the radial direction defining a center hole for accommodating a rotor, and the multiple stator teeth being spaced from each other in a circumferential direction, and multiple stator slots, each stator slot being defined between two neighboring stator teeth.
  • the winding is wound on the stator teeth and operable for generating a rotating magnetic field.
  • the yoke of the stator iron core has at least two cut edges at an outer periphery of the stator iron core, and distances from center points of neighboring cut edges to a center of the stator iron core are not all the same. Besides, there are an even number of cut edges in which every two opposite cut edges forming a pair are arranged on two sides of the center of the stator iron core. In addition, two opposite cut edges in at least one pair of cut edges are arranged to form an angle between the two opposite cut edges.
  • a stator for a single-phase or polyphase motor includes a stator iron core and a winding.
  • the stator iron core includes: an annular yoke; multiple stator teeth, near ends of the stator teeth being fixedly adjacent to an inner surface of the yoke and projecting inward towards a center of the stator iron core along a radial direction of the yoke, remote ends of the stator teeth that face inward along the radial direction defining a center hole for accommodating a rotor, and the multiple stator teeth being spaced from each other in a circumferential direction; and multiple stator slots, each stator slot being defined between two neighboring stator teeth.
  • the winding is wound on the stator teeth and operable for generating a rotating magnetic field.
  • the yoke of the stator iron core has at least two cut edges at an outer periphery of the stator iron core, and distances from center points of neighboring cut edges to a center of the stator iron core are not all the same.
  • there are an odd number of cut edges, and included angles between neighboring cut edges among the odd number of cut edges are not the same in the circumferential direction.
  • a cut-off area of the cut edges can be changed by adjusting the size and shape of the cut edges, so as to optimize a gas path and an oil path inside a shell of a compressor, thereby enhancing cooling performance of a motor and reducing oil circulation rate (OCR).
  • OCR oil circulation rate
  • the use of asymmetrically-arranged cut edges with a limited size can save materials and ensure a utilization rate of a stator iron core.
  • cut edges are disposed on the stator iron core of the motor, particularly on the outer surface of the yoke, a smoother oil path can be achieved, thereby improving energy efficiency of the compressor.
  • the cut edges of the stator iron core have a limited cut length from the circumference of the stator iron core, the asymmetrical arrangement is enough to ensure the cooling and heat dissipation effect.
  • the cut edges with a limited size can ensure the firmness of the stator mounted into the shell of the motor and also can increase the cross-sectional area for bearing the deformation on the stator, thereby greatly reducing a possibility of severe deformation of the stator.
  • FIG. 1 is a schematic diagram of a compressor including a three-phase induction motor according to a first embodiment of the present invention
  • FIG. 2A is a schematic cross-sectional view of a stator in the three-phase induction motor in FIG. 1 , where a rotor is not shown;
  • FIG. 2B is a schematic cross-sectional view of a stator in the three-phase induction motor in FIG. 1 , where a rotor is not shown;
  • FIG. 2C is a schematic cross-sectional view of a stator in the three-phase induction motor in FIG. 1 , where a rotor is not shown;
  • FIG. 2D is a schematic cross-sectional view of a stator in the three-phase induction motor in FIG. 1 , where a rotor is not shown;
  • FIG. 3 is a graph showing a voltage-temperature relation in a compressor with a conventional motor under an operation condition of 50 Hz, and a voltage-temperature relation in a compressor with a motor including the stator iron core of FIG. 2 under an operation condition of 50 Hz;
  • FIG. 4 is a graph showing a voltage-temperature relation in a compressor with a conventional motor under an operation condition of 60 Hz and a voltage-temperature relation in a compressor with a motor including the stator iron core of FIG. 2 under the operation condition of 60 Hz.
  • a compressor is used in an air conditioning or refrigeration industry.
  • the compressor can convert mechanical energy into a potential energy for compressing a fluid, and may be classified into a reciprocating compressor, a scroll compressor, a centrifugal compressor, and a vane compressor.
  • an orbiting scroll orbits around the center of a base circle of a fixed scroll, and the volume of a compression chamber formed by cooperation of the orbiting scroll and the fixed scroll is gradually reduced, so as to compress gas.
  • the orbiting scroll is directly supported on a housing fixed inside a compressor shell.
  • one end (upper end) of a crankshaft for driving the orbiting scroll to orbit is connected to the orbiting scroll through a center hole of the housing, and the other end (lower end) of the crankshaft is directly supported on a lower bearing support fixed inside the shell of the scroll compressor.
  • suction, compression and discharge operations can be achieved when the crankshaft rotates clockwise or anti-clockwise.
  • the compressed gas is discharged through a discharge valve to a high-pressure chamber of the scroll compressor, and is finally discharged to the outside of the scroll compressor through a discharge port.
  • FIG. 1 shows a scroll compressor 100 of the present invention.
  • the scroll compressor 100 includes: a scroll compressor shell 1 ; a housing 2 , fixed inside the scroll compressor shell 1 ; a fixed scroll 3 , fixed inside the shell 1 ; an orbiting scroll 4 , orbitably supported on the housing 2 and cooperating with the fixed scroll 3 to form a compression chamber 11 ; a lower support 5 , fixed to a lower end of the shell 1 ; an actuating mechanism 7 such as a motor, fixed to a lower end of the scroll compressor 100 , and configured to transfer a rotating force though a crankshaft structure 6 , the crankshaft structure 6 having an upper end connected to the orbiting scroll 4 to drive the orbiting scroll 4 to orbit and a lower end supported on the lower support 5 ; and a discharge valve 8 , configured to discharge a gas from the compression chamber 11 and prevent the gas from flowing back to the scroll compressor 100 .
  • the orbiting scroll 4 is supported on an upper surface or a bearing surface of the housing 2 .
  • the shell 1 defines an enclosed space in the scroll compressor, accommodating components such as the fixed scroll 3 , the orbiting scroll 4 and the housing 2 .
  • the volute of the fixed scroll 3 and the volute of the orbiting scroll 4 are engaged or jointed with each other to form the compression chamber 11 .
  • the fixed scroll 3 is disposed above the orbiting scroll 4 .
  • the motor 7 includes a stator and a rotor. The motor drives the orbiting scroll 4 through the crankshaft structure 6 .
  • the scroll compressor 100 takes in the gas through a suction port 9 .
  • the actuating mechanism 7 for example, the motor
  • the orbiting scroll 4 is driven by the crankshaft structure 7 and restricted by an anti-rotation mechanism Oldham coupling 6 , orbiting with a small radius around the center of a base circle of the fixed scroll 3 , so as to generate a high-pressure high-temperature gas in the compression chamber 11 formed by the orbiting scroll 4 and the fixed scroll 3 .
  • the high-pressure high-temperature gas is discharged into the high-pressure chamber 12 through the discharge valve 8 along with the movement of the orbiting scroll 4 .
  • the discharge valve 8 is used to prevent backflow of the gas in the high-pressure chamber 12 .
  • the gas in the high-pressure chamber 12 is discharged to the outside of the scroll compressor through a discharge port 10 . The above-mentioned process is repeated, which can continuously generate the high-temperature high-pressure gas in the scroll compressor 100 .
  • the housing 2 includes a housing body 21 and a housing support plate 22 .
  • the housing body 21 may be fixed inside the shell 1 by interference fit, and may be overlapped onto an end face of the shell 1 of the scroll compressor 100 .
  • the housing support plate 22 may be fixed to the housing body 21 by means of clearance fit.
  • a sliding slot of the housing support plate 22 is overlapped and connected onto the housing body 21 , thereby fixing the housing support plate 22 and preventing the housing support plate 22 from rotation.
  • the Oldham coupling 23 has a pair of upper projecting portions and a pair of lower projecting portion. The projecting portions in each pair are opposite to each other and the two pairs are distributed in a cross pattern.
  • the lower projecting portions are inserted into the sliding slot on the housing support plate 22 , and the upper projecting portion is inserted into an ear-shaped groove of the orbiting scroll 4 . While the scroll compressor 100 is working, the orbiting scroll 4 can orbit with a small radius relative to the housing support plate 22 .
  • a thrust bearing disk 24 may further be arranged between the orbiting scroll 4 and the Oldham coupling 23 , in order to increase the bearing area for the orbiting scroll 4 .
  • the thrust bearing disk 24 is fixed and overlapped onto the housing support plate 22 by means of interference fit, and is adapted to support the orbiting scroll 4 .
  • the motor for a compressor is generally a three-phase induction motor. It should be noted that the motor is not limited to the three-phase induction motor.
  • the three-phase induction motor illustrated herein is an example, and the inventive concept of the present invention can be applied to other types of motors.
  • the three-phase induction motor of the present invention is not limited to the application in the scroll compressor described in FIG. 1 , but may also be applied to other types of compressors.
  • a three-phase motor or a three-phase induction motor generally includes a stator, a rotor, and other related parts (such as a shell).
  • a stator of an existing three-phase induction motor is improved.
  • the improved stator can be used to replace an existing stator in the three-phase induction motor.
  • the rotor is rotatably disposed inside the stator and spaced apart from the stator by a distance.
  • An operating voltage of the motor or the motor's driver may range from 200 V to 575 V. It should be noted that the motor is not limited to a specific type of motor, and may be, for example, a single-phase motor or a polyphase motor such as a three-phase motor.
  • a three-phase induction motor for a scroll compressor particularly, the structure of a stator in the motor, will be described hereinafter according to embodiments of the present invention with reference to the accompanying drawings.
  • FIG. 2A - FIG. 2D are schematic cross-sectional views of a stator in a three-phase induction motor according to an embodiment of the present invention.
  • the three-phase induction motor includes a stator and a rotor.
  • the stator 70 includes a stator iron core 71 and a winding.
  • the stator iron core 71 is in an approximately-cylindrical shape or other feasible shape.
  • the stator iron core has a hollow circular center hole 75 , operable for accommodating the rotor therein.
  • the stator iron core 71 includes: an annular yoke 74 ; multiple stator teeth 72 extending inward along a radial direction of the stator and evenly spaced apart from each other in a circumferential direction of the stator; and stator slots 73 distributed between the multiple stator teeth 72 .
  • the winding is wound on the stator teeth 72 and spatially spaced in sequence by an electrical angle such as 120°, and is operable for generating a rotating magnetic field.
  • the winding may be, for example, a three-phase winding.
  • the stator slots 73 are evenly distributed along the circumferential direction of the stator.
  • the multiple stator teeth 72 are arranged on an inner surface of the yoke 74 .
  • the stator teeth project, starting from their respective near ends adjacent to the yoke 74 , inward towards the center of the stator iron core 71 along a radial direction of the yoke, and terminate at the center hole 75 with their respective remote ends. Therefore, the center hole 75 is substantially defined by the remote ends of the stator teeth 72 .
  • the remote ends of the stator teeth 72 may extend in a swallowtail pattern as shown in FIG. 2A - FIG. 2D , operable for defining the center hole 75 that is able to accommodate the rotor more effectively.
  • the stator slots 73 may have a water drop shape that has a gradually increasing width as it extends outward along the radial direction, which makes it more convenient to arrange the winding in the stator slots.
  • such water drop shape shown in FIG. 2A - FIG. 2D can be manufactured more easily.
  • Each of the stator slots 73 may be defined between two neighboring stator teeth. Therefore, the number of stator slots 73 is equal to the number of stator teeth 72 . In this embodiment, both the number of stator teeth 72 and the number of stator slots 73 may be 24 .
  • the yoke 74 of the stator iron core 71 has at least two cut edges on its outer periphery.
  • the yoke 74 has six cut edges on the outer periphery.
  • the cut edges are grouped in pairs.
  • the two cut edges in each pair are disposed in parallel at opposite positions on the outer periphery of the yoke 74 , and are respectively located on two sides of the center of the stator iron core 71 along the diameter direction of the yoke 74 .
  • the cut edges are asymmetrically arranged relative to the center of the stator iron core.
  • each of the cut edges is substantially a chord cut edge between two arc segments.
  • the six arc segments arranged at intervals between the cut edges are arcs of a same circle, and the center of the circle coincides with the center of the stator iron core 71 .
  • the cut edge 76 and the cut edge 76 ′ are disposed opposite to and in parallel with each other, and form a first pair of cut edges; the cut edge 77 and the cut edge 77 ′ are disposed opposite to and in parallel with each other, and form a second pair of cut edges; the cut edge 78 and the cut edge 78 ′ are disposed opposite to and in parallel with each other, and form a third pair of cut edges.
  • the arc segments between the cut edges are not evenly distributed along the circumferential direction, and the arc segments may not necessarily have the same length.
  • the pairs of cut edges 76 , 76 ′, 77 , 77 ′, 78 , and 78 ′ are in the circumferential direction of the yoke, and are not evenly distributed.
  • each pair of cut edges has a connecting line between respective center points of the two cut edges, the three respective connecting lines of the three pairs converge at the center of the stator core iron, while dividing the entire circumferential direction into segments with different central included angles.
  • stator iron core is, for example, preferably made of a silicon steel sheet material by lamination and stamping when considering factors including mechanical properties of materials, machinability and cost performance.
  • the stator iron core is an integral unit, and is preferably formed by a process of stamping silicon steel sheets on which cut edges, stator teeth, and stator slots have been formed: or, by a process of stamping silicon steel sheets and then performing edge-cutting on an outer periphery of the stamped silicon steel sheets.
  • the stator iron core has a simple structure that can be manufactured easily.
  • a suction port for gas suction in the compressor is configured closer to a longer cut edge in a pair of cut edges in order to improve gas suction.
  • the suction port 9 in the compressor shown in FIG. 1 is located closer to the cut edges 76 ′, 77 ′, and 78 ′ each of which corresponds to a larger cross-sectional area cut from the stator than its opposite cut edge, that is, has a larger length than its opposite cut edge has.
  • the suction port is adjacent to a cut edge whose center point is closer to the center of the stator iron core than the other cut edge in the same pair.
  • the motor may further include a shell (now shown) for containing the stator and the rotor, a base, and other common components.
  • a shell for containing the stator and the rotor
  • a base for containing the stator and the rotor
  • other common components for containing the stator and the rotor
  • the shell or structures for connecting the shell and the stator or the like will not be described in detail herein.
  • stator with asymmetrical cut edges of the present invention is further described below through specific embodiments and with reference to, for example, FIG. 3 and FIG. 4 .
  • a conventional motor design without a cut edge is compared with a motor design with a stator iron core having multiple asymmetrical cut edges.
  • FIG. 3 and FIG. 4 are respective voltage-temperature graphs of a compressor using a conventional motor and a compressor using a motor having the stator iron core with the above-mentioned cut-edges under operation conditions of 50 Hz and 60 Hz.
  • a curve a represents the compressor using the conventional motor
  • a curve b represents the compressor using the motor whose stator has the asymmetrical cut edges as described in the present invention, particularly, the asymmetrical cut edges as shown in FIG. 2A - FIG. 2D .
  • the curves a and b in FIG. 3 and FIG. 4 gradually go down as the voltage decreases, and the curve b is always below the curve a.
  • the stator iron core with the asymmetrical cut edges can effectively improve the cooling effect of the motor, and that the temperature of the motor can be effectively controlled.
  • the compressor including the motor whose stator has the above-mentioned asymmetrical cut edges has a better cooling and heat dissipation effect than the compressor including the conventional motor, and is always controlled to maintain a lower temperature.
  • multiple cut edges may be disposed on the outer periphery of the yoke of the stator iron core.
  • the cut edges are in pairs but not all of the cut edges are symmetrically disposed.
  • an even number of cut edges are disposed in pairs and opposite to each other on two sides of diameters passing through the center of the stator iron core, not all the pairs of cut edges are symmetrically arranged.
  • respective distances from respective center points of cut edges in at least one pair of cut edges to the center of the stator iron core are different; or, the cut edges in at least one pair of cut edges are disposed opposite to each other on the two sides of the center of the stator iron core, but are not in parallel, that is, form an angle therebetween.
  • the above-mentioned embodiments have the same general technical concept, that is, the cut edges on the outer periphery of the yoke of the stator iron core are asymmetrically arranged. More specifically, not all respective distances from respective center points of neighboring cut edges to the center of the stator iron core are the same. Therefore, as required, any number of asymmetrically arranged cut edges may be disposed on the outer periphery of the yoke of the stator iron core.
  • the present invention is not limited to the above-mentioned embodiments, and changes which are feasible within the overall dimension of the yoke of the stator iron core, such as changes in the distance between the cut edges and the lengths of the arc segments between the cut edges, shall also be encompassed by the protection scope of the present invention.
  • the remote end of the stator teeth that extend inward may be a projecting portion in the shape of a square, a semicircle, or the like.
  • the stator slots may be in a rectangular shape, in a shape such as a down trapezoid that has a gradually increasing width as it extends outward along the radial direction, in a semicircular shape, or the like.
  • the objectives of the present invention can also be achieved with such changes.
  • the number of stator teeth and the number of stator slots may both be set to four, eight, twelve, or other values according to requirements of practical use.
  • the number and the shape of the stator teeth and the stator slots as well as the lengths and arrangement of the arc segments between the cut edges may be configured freely as long as functions and advantages of the asymmetrically-arranged cut edges of the present invention can be achieved.
  • a compressor generally needs be driven by a motor.
  • the interior permanent magnet motor of the present invention can be applied to any compressor known in the prior art or any future compressor.
  • the operating voltage of the compressor is a medium or low voltage that is lower than or equal to 600 V.
  • stator iron core and the motor including the stator iron core of the present invention are described below with reference to specific embodiments, that is, principles for improving the cooling performance and lowering the temperature during operation will be described below.
  • the motor particularly the three-phase induction motor
  • the cross-section of the stator is placed vertically, and oil in an oil path flows along an outer periphery of the motor and is sucked through a suction port from the side of the motor.
  • a gas flow has an obvious lifting force, it will affect the flow of the oil downward to the suction port, leading to unsmooth circulation in the oil path.
  • the gap between the outer periphery of the yoke and the shell of the motor is small and the cooling and heat dissipation effect of the gas flow is affected; or, since the gas flow is evenly distributed within the motor, the circulation in the oil path is affected, and even worse, accumulation of excessive heat may be brought to the motor.
  • asymmetrically-arranged cut edges may be arranged on the outer periphery of the yoke of the stator iron core.
  • a gas flow passes through the gap between the cut edges and the shell of the motor, and thereby the cooling effect is enhanced.
  • the arrangement of the asymmetrical cut edges changes the even distribution of the gas flow between the outer periphery of the stator iron core and the shell, thereby avoiding an even lifting gas flow and interrupting the lifting gas flow from preventing the oil from the falling down.
  • the circulation in the oil path is smoother and the heat accumulation on the motor is reduced. Therefore, the cooling and heat dissipation performance of the motor is directly or indirectly improved, while ensuring the stable operation of the motor and the compressor including the motor, and substantially maintaining the efficiency at the same level as that of the conventional motor and compressor.
  • the gas path and the oil path in the compressor can be flexibly adjusted because the asymmetrical cut edges are disposed on the yoke of the stator iron core. Therefore, the cooling effect and the oil path can be improved, the cooling performance of the motor can be enhanced, the oil circulation rate (OCR) can be reduced, and while the performance, particularly the efficiency, of the motor can be substantially maintained.
  • the asymmetrical cut edges remove the defect of insufficient cross-sectional area for the cooling path in a circular stator iron core, save materials and improve the cost performance ratio to the most extent.
  • the asymmetrical cut edges are a good design for cooling and heat dissipation.
  • the cut edges are disposed on the stator iron core of the motor, particularly on the outer surface of the yoke, a smoother oil path can be achieved, thereby the energy efficiency of the compressor can be improved.
  • the asymmetrical arrangement can still ensure the cooling and heat dissipation effect.
  • the cut edges with a limited cutting depth in the stator iron core can ensure the firmness of the stator mounted into the shell and also can increase the cross-sectional area for bearing the deformation on the stator, thereby greatly reducing the possibility of severe deformation of the stator.
US15/392,350 2015-12-31 2016-12-28 Stator applicable to a single-phase or polyphase motor, motor comprising the stator and compressor comprising the motor or the stator Active 2037-12-25 US10389216B2 (en)

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